Allergy Asthma Immunol Res.
2013 Nov;5(6):377-382. 10.4168/aair.2013.5.6.377.
IL-13 R110Q, a Naturally Occurring IL-13 Polymorphism, Confers Enhanced Functional Activity in Cultured Human Bronchial Smooth Muscle Cells
- Affiliations
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- 1Department of Pediatrics, Xinhua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China. dr.smilebao@yahoo.com.cn
- KMID: 2260281
- DOI: http://doi.org/10.4168/aair.2013.5.6.377
Abstract
- PURPOSE
Interleukin (IL)-13, a Th2-type cytokine, plays a pivotal role in the pathogenesis of asthma through its direct effects on airway smooth muscles. A naturally occurring IL-13 polymorphism, R110Q, is strongly associated with increased total serum IgE levels and asthma. In the present study, we aimed to determine whether the IL-13 R110Q variant would display different biochemical properties or altered functions in comparison with wild-type (WT) IL-13 in cultured human bronchial smooth muscle cells (hBSMCs).
METHODS
Culture supernatants and cell proteins were collected from cultured hBSMCs that were treated with 50 ng/mL IL-13 or IL-13 R110Q for 24 hours. Eotaxin released into hBSMC culture medium was determined by ELISA. The expression levels of the high-affinity IgE receptor (FcepsilonRI) alpha-chain, smooth muscle-specific actin alpha chain (alpha-SMA), smooth muscle myosin heavy chain (SmMHC), and calreticulin in the cells were measured on Western blots.
RESULTS
Compared with WT IL-13, treatment with the IL-13 R110Q variant resulted in a significant increase in eotaxin release as well as significant, although modest, increases in the expression levels of alpha-SMA, SmMHC, calreticulin, and FcepsilonRI alpha-chain.
CONCLUSIONS
The results of the present study suggenst that the IL-13 R110Q variant may enhance enhanced functional activities in hBSMCs.
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